What is the term for the changing room for baths in ancient Roman structures?

The term for the changing room for baths in ancient Roman structures is indeed the apodyterium. This rooms served as the entrance area where bathers would undress and store their clothing in niches before proceeding to the various bathing areas of the thermae. The apodyterium typically featured benches or ledges for convenience and sometimes had frescoes or elaborate decorations to create an inviting atmosphere.

In contrast, the frigidarium refers to the cold water bath area, designed for a refreshing plunge. The palaestra was an exercise area used for physical activities and training, while the natatio is the term for the swimming pool within the complex. Each of these areas served distinct functions within the elaborate design of Roman bathhouses, highlighting the sophisticated social and cultural aspects of bathing in ancient Rome.